video_category

2 rows where c_uid = "c_7j5s3"

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Link v_uid c_uid
v_iccmw,c_7j5s3 v_iccmw Black Man c_7j5s3
v_ixw89,c_7j5s3 v_ixw89 Black Man c_7j5s3

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CREATE TABLE video_category (
  v_uid TEXT NOT NULL REFERENCES videos(uid)     ON DELETE CASCADE,
  c_uid TEXT NOT NULL REFERENCES categories(uid) ON DELETE CASCADE,
  PRIMARY KEY (v_uid, c_uid)
);
CREATE INDEX idx_video_category_c ON video_category(c_uid);